Brush for dynamo-electrical machines.



B. G. KETGHUM & D. H. ANDREWS.

BRUSH FOR DYNAMO ELECTRICAL MACHINES.

APPLICATION FILED 001'. 16, 1912.

1,087,381, Patented Feb. 17, 1914.

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UNITED STATES PATENT OFFICE.

ERNEST C. KETCI-IUM, 015 BOSTON, AND DAVID H. ANDREWS, OF NEWTON, MASSACHUSETTS.

BRUSH FOR DYNAMO-ELECTRICAL MACHINES.

To all whom it may concern.

Be it known that we, ERNEST C. KE'roHUM, a citizen of the United States of America, and a resident of Boston, in the county of Suffolk and State of Massachusetts, and DAVID H. ANDREWS, a citizen of the United States of America, and a resident of Newton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Brushes for Dynamo-Electrical Machines, of which the following is a specification.

This invention relates to armature brushes and holders therefor to be used in connection with dynamo electrical machines, and it has for its object the production of a device of this kind which may be readily detached from the main supports and the brush of which is made up of a plurality of members permanently secured together to make a compact solid body portion adapted to be secured to the removable section of the holder.

The invention consists in certain novel features of construction and arrangement of parts which will be readily understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents a plan view of the holder and brush embodying the features of the present invention. Fig. 2 represents an elevation of the same partially broken in section. Fig. 3 represents a perspective of a bent plate adapted to form part of the brush, and Fig. 4 is a perspective of one of the shims interposed between the bent plates.

Similar characters designate like parts throughout the drawings.

In the drawings, 10 is the main support for the brush secured to the dynamo electrical machines in any suitable manner. To the main support 10 is secured by means of the bolt 11 a removable section 12, the under face 18 of which is at an angle to the under face of the main support 10. To this under face 13 of the removable section 12 is secured a brush 1 1 composed of a plurality of bent plates 15 of copper or some other metal having a high degree of conductivity between the inner ends of which are interposed shims 16 of similar material. In constructing the brush 14, the shims 16 and the adjacent Specification of Letters Patent.

Application filed October 16, 1912.

Patented Feb. 17,1914.

Serial No. 726,359.

surfaces of the bent plates 15 are first dipped in solder and then clamped together by some suitable means. The soldering of the various members together is then completed by the application of heat in any well-known man ner. hen the solder is set and these shims and the ends of the bent plates 15 have become firmly united together to form a solid compact body portion for the brush from which extends a plurality of yielding ends of the plates 15, the clamp may be removed. One means only of securing these plates together during the soldering operation is shown in the drawings, and that is by means of the bolts 17 extending through the holes 18 in like ends of all of the bent plates 15 and through similar openings 19 in all of the shims 16, the ends of the bolts 17 being threaded and provided with nuts 20 to clamp said ends of the plates 15 and shims 16 solidly together. After the soldering has been completed these members 17 may be removed if desired or remain positioned in the body portion of the brush. The brush is then secured to the under face 13 of the removable section 12 by means of the bolts 21 and 22 extending through the member 12 and threaded to the body portion of said brush 14, as clearly indicated at the left of Fig. 2 of the drawings.

\Vhen it is desired to change or adjust the brush for any reason the section 12 may be readily removed from the main support 10 by the removal of the bolt 11. This makes a very effective brush for dynamo electrical machines. By such a construction the brush is adapted to make a contact over a considerable surface of the disk of the armature, and owing to the separation of the various plates the amalgam used on the disks will not collect between the various plates and make a continuous contacting surface as would be true of brushes as heretofore constructed. It is believed that its many advantages will be fully apparent without any further description.

Having thus described our invention, We claim:

1. A brush for dynamo electrical machines, composed of a plurality of plates having a high degree of conductivity separated at one end by narrow shims of similar material and all soldered together.

2. A brush for dynamo electrical machines, composed of a plurality of bent copper plates separated at one end by shims of copper and means for securing said ends and shims together.

3. A brush for dynamo electrical machines composed of a plurality of bent copper plates separated at one end and having interposed between the opposite ends shims of copper and means for securing said opposite ends and shims together extending through said shims and the corresponding ends of said plates.

l. A brush for dynamo electrical machines, composed of a plurality oi bent copper plates secured together at one end by solder to make a compact body portion, combined With a divided holder means for securing together the two parts of said holder, and

bolts extending through said holder and threaded to said body portion.

5. A brush for dynamo electrical machines composed of a plurality of separated plates having thin conducting material interposed between corresponding ends thereof.

6. A brush for dynamo electrical machines composed of a plurality of separated copper plates having narrow strips of copper interposed between corresponding ends thereof and soldered thereto.

Signed by us at s Post Ollice Sq, Boston, Mass, this 15th day of October, 1912.

ERNEST C. KE"CHUM. DAVID H. ANDREWS.

NATHAN U. LOMBARD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Intent. Washington, D. C. 

